The current transformer tester is an important power equipment testing tool, used to measure the current, power, and electric energy on the high-voltage or low-voltage line, and plays the role of insulation and isolation to ensure the safety of operators and instruments. Next, we will introduce to you the working principle, characteristics, and how to detect the current transformer tester.
Current Transformer Testers' basics
The current transformer tester is a transformer field test instrument developed on the basis of the original successful development of the transformer calibrator and the detailed analysis of the transformer mathematical model. It can measure CT volt-ampere characteristics, 5% and 10% error curves, direct resistance, and transformation ratio polarity according to national standards.
The current transformer tester can also directly measure the transformation ratio, ratio difference, polarity, and actual secondary load of the current/voltage transformer, etc. of the voltage transformer.
The instrument adopts high-precision, automatic linear adjustment DC power supply, and AC power supply, and has a high-speed, high-reliability digital processing module. The high measurement accuracy and high stability pre-measurement circuit ensures the accuracy and high stability of instrument measurement. The instrument has a humanized man-machine interface, which prompts wiring and operation, and has the function of saving any measurement parameters and printing the measurement results.
Working principle
The current transformer tester is an instrument for testing transformers, and its working principle is based on the principle of electromagnetic induction of transformers. The current transformer tester determines the parameters of the transformer by measuring the current and voltage of the transformer. A transformer tester consists of a power supply, a current source, a voltage source, and a measuring instrument. The power supply is used to provide the test current and test voltage, the current source is used to generate the test current, the voltage source is used to generate the test voltage, and the measuring instrument is used to measure the test current and test voltage.
A transformer is an electrical component that transfers electrical energy from one circuit to another, varying both voltage and current. Transformers are usually used in power systems to measure current and voltage to ensure the safe and stable operation of the power system.
How to test Current Transformer Tester?
When testing a transformer, it is first necessary to connect the transformer to the test instrument. The test current and test voltage are then generated by the power supply, current source, and voltage source and input into the transformer. The transformer converts the test current and test voltage into output current and output voltage, which are then output to the measuring instrument. The measuring instrument will measure the output current and output voltage, and calculate the parameters of the transformer based on these data, such as transformation ratio, error, etc.
Features
The instrument can perform qualitative measurements on voltage transformers. When measuring, the instrument can add a certain power frequency voltage to one side of the voltage transformer to measure its primary voltage and secondary induced voltage, and obtain the transformation ratio and polarity of the voltage transformer under this voltage and the ability to the conclusion of the volt-ampere characteristic experiment of the voltage transformer.
The instrument can measure the on-site secondary load of current and voltage transformers, and can also measure the ratio difference and angle difference of the current transformer under the load. Comes with a large-screen graphics LCD, full Chinese graphics surface, clear and beautiful, intuitive and convenient. The volt-ampere curve is directly displayed during the test, and the built-in thermal printer can quickly print the curve and test data, and can also store the test data at any time.
Here are strong scalabilities:
a) The test can be done with an external voltage regulator: if the output voltage and current of the single unit of the device cannot meet the requirements, it is also possible to use the voltage regulator prepared by the user to connect to the device for testing. The test wiring and test method of the external voltage regulator are very simple.
b) Optional external booster: The optional external booster can be boosted up to 2000V, 3A, and the external booster can be used for the volt-ampere characteristic test of the current transformer.
It can be used to measure large currents and high power on high-voltage or low-voltage lines, using a unified 5A secondary line and measuring instrument.
In the power system, in order to ensure the normal power supply and protect the safety of valuable equipment, there is a set of relay protection circuits composed of various relay control equipment. When a fault occurs in the power system, these protection devices will act to cut off the faulty line. If it is an accidental fault, it can also automatically close the switch to ensure a normal power supply.
Protect the current transformer. It is to change the current on the line into a current of a certain size to supply power to protective devices such as relays. When a short circuit or other fault occurs on the line, the current on the line increases sharply, and the current supplied to the relay and other protective devices through the current transformer tester also increases sharply, so that the relay protection device operates and the faulty line is cut off.
When the current transformer tester is measuring, the measured secondary current is converted into the primary current according to the rated current ratio.
The current transformer tester is connected to the line and is mainly used to change the voltage of the line, while the current transformer is connected to the line, the current transformer tester can change the current of the line, so the current transformer tester was originally called a converter.
